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[英]Flutter Cloud Firestore: error: The argument type 'Object? Function()' can't be assigned to the parameter type 'Map<String, dynamic>'
[英]Flutter The argument type 'Object?' can't be assigned to the parameter type 'Map<String, dynamic>'
参数类型“对象?” 无法分配给参数类型“Map<String, dynamic>”。 我不明白如何解决这个问题。
@override
Future<List<Users>?> getAllUsers() async {
QuerySnapshot querySnapshot = await firestore.collection("users").get();
List<Users> allUsers = [];
allUsers = querySnapshot.docs.map((e) => Users.fromMap(e.data())).toList();
return allUsers;
}
QuerySnapshot<Map<String, dynamic>> querySnapshot = await firestore.collection("users").get();
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